Registration as self and interface problem

[Grave18]

[Update] In manifest.json I am switch from 1.17 to 1.16 and back and now it all magically work again!

I am using VContainer 1.17.0

i've got something like this:

builder.Register<MainViewModel>(Lifetime.Scoped).As<IMainViewModel>().AsSelf();
// or
builder.Register<IMainViewModel, MainViewModel>(Lifetime.Scoped).AsSelf();
...
builder.RegisterBuildCallback(r =>
      {
          // This is for example in code this is also exeption
          var mainVmBase = r.Resolve<IMainViewModel>(); // This is normal
          var mainVm = r.Resolve<MainViewModel>(); // Error here no such registration
      });

I don't understand what I am doing wrong? Is this because somewhere is circular dependency in code?

[tigran-sargsyan-w]

This is expected behavior.

Register<IMainViewModel, MainViewModel>() only registers the service (IMainViewModel). So Resolve<IMainViewModel>() works, but Resolve<MainViewModel>() won’t unless you also register the concrete.

Just add .AsSelf() on the concrete registration:

builder.Register<MainViewModel>(Lifetime.Scoped)
    .As<IMainViewModel>()
    .AsSelf();

(or register MainViewModel separately as self).

Not a circular dep thing — if it was, you’d get a circular dependency error, not “no such registration”. Also worth noting: resolving stuff inside RegisterBuildCallback is kinda “pulling” things early; usually I’d rather inject where needed, but for debugging this is fine.

[tigran-sargsyan-w]

Glad to hear it's working again. If the registration explanation above matches the original issue, feel free to mark it as the answer so the resolution is easier to find for others.